# -*- coding: utf-8 -*-

# Define here the models for your spider middleware
#
# See documentation in:
# https://doc.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals
from selenium import webdriver
from scrapy.http import HtmlResponse
import time
from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from random import choice



#
# class CarnewsSpiderMiddleware(object):
#     # Not all methods need to be defined. If a method is not defined,
#     # scrapy acts as if the spider middleware does not modify the
#     # passed objects.
#
#     @classmethod
#     def from_crawler(cls, crawler):
#         # This method is used by Scrapy to create your spiders.
#         s = cls()
#         crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
#         return s
#
#     def process_spider_input(self, response, spider):
#         # Called for each response that goes through the spider
#         # middleware and into the spider.
#
#         # Should return None or raise an exception.
#         return None
#
#     def process_spider_output(self, response, result, spider):
#         # Called with the results returned from the Spider, after
#         # it has processed the response.
#
#         # Must return an iterable of Request, dict or Item objects.
#         for i in result:
#             yield i
#
#     def process_spider_exception(self, response, exception, spider):
#         # Called when a spider or process_spider_input() method
#         # (from other spider middleware) raises an exception.
#
#         # Should return either None or an iterable of Response, dict
#         # or Item objects.
#         pass
#
#     def process_start_requests(self, start_requests, spider):
#         # Called with the start requests of the spider, and works
#         # similarly to the process_spider_output() method, except
#         # that it doesn’t have a response associated.
#
#         # Must return only requests (not items).
#         for r in start_requests:
#             yield r
#
#     def spider_opened(self, spider):
#         spider.logger.info('Spider opened: %s' % spider.name)


class CarnewsDownloaderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called

        click_page_url = "https://www.autohome.com.cn/news/"
        # print(
        #     "111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111")
        if request.url == click_page_url:
            driver = webdriver.PhantomJS()
            try:
                driver.maximize_window()
                driver.set_window_size(1920, 1080)  # 分辨率 1280*800
                driver.get(request.url)
                driver.implicitly_wait(3)

                time.sleep(5)
                # print("111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111")
                print(driver.get_window_size())
                # 将页面滚动条拖到底部
                for y in range(30):
                    js = 'window.scrollBy(0,1000)'
                    driver.execute_script(js)
                    time.sleep(0.5)

                true_page = driver.page_source
                driver.close()

                return HtmlResponse(request.url, body=true_page, encoding='utf-8', request=request, )

            except:
                print
                "get news data failed"
        else:
            return None



    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)
